I bought an extra carseat for my sisters car as DH rides gis Harley to work, I have a car seat in my car & 1 in my sisterts & Mum & Dad have my nieces old one... If/when we have another bay (as Maddy is 7 & not in a car seat anymore) we'd probably buy 2 more... 1for us & 1 for my sister, as Mum & dad live behind our house & we could leave the car seat out during week, as I only go to work & back.. (does that make sense!?)